Provision to start base::SimpleTestTickClock at initial ticks

components/scheduler/renderer/idle_time_estimator_unittest.cc

Index: components/scheduler/renderer/idle_time_estimator_unittest.cc
diff --git a/components/scheduler/renderer/idle_time_estimator_unittest.cc b/components/scheduler/renderer/idle_time_estimator_unittest.cc
index 99105cccda5e64306b03b34a03b27a321b78b536..2767a0d941323cc4abc36eaea97f16157f778ae0 100644
--- a/components/scheduler/renderer/idle_time_estimator_unittest.cc
+++ b/components/scheduler/renderer/idle_time_estimator_unittest.cc
@@ -35,8 +35,8 @@ class IdleTimeEstimatorTest : public testing::Test {
   ~IdleTimeEstimatorTest() override {}
 
   void SetUp() override {
-    clock_.reset(new base::SimpleTestTickClock());
-    clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
+    clock_.reset(new base::SimpleTestTickClock(
+        base::TimeTicks() + base::TimeDelta::FromMicroseconds(5000)));
     test_time_source_.reset(new TestTimeSource(clock_.get()));
     mock_task_runner_ = make_scoped_refptr(
         new cc::OrderedSimpleTaskRunner(clock_.get(), false));